I [29/M] want to ask someone out...

Hi everyone. I [29/M] want to ask a girl [29/F] I met through church out on a coffee date, but I don't know if I am being too forward. I met her about a month and a half ago. We hang out with each other about three or four times a week (usually in a group setting). I don't have her number yet because I haven't had an excuse to ask for it. I basically wanted to go up to her, tell her I was interested in her, and ask her out for coffee (or something similarly casual). I don't know if this is being too forward or if I should pursue another course of action? Any advice would be appreciated. Thanks!